package com.dhy.servlet; import java.io.IOException; import java.sql.Connection; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.dhy.dao.BaseDao; import com.dhy.dao.UsersDao; import com.dhy.bean.Users; public class Loginservlet extends HttpServlet { //声明 private final String SUCCESS_VIEW = "MyJsp.jsp"; private final String ERROR_VIEW = "index.jsp"; private UsersDao userDao = new UsersDao(); private BaseDao basedao = new BaseDao(); protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ //1.防止乱码 request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); //2.获取页面信息 String username = request.getParameter("username"); String password = request.getParameter("password"); //3.获取登录用户信息 request . getSession().setAttribute ( "UserName" , username ) ; request.getSession().setAttribute("password", password); Connection con=null; //4.验证操作，将用户信息封装到currentUser try { Users user = new Users(username,password); con = basedao.getConnection(); Users currentUser = userDao.login(con, user); if (null == currentUser) { //5.输入信息错误 request.setAttribute("error", "用户名或密码错误"); request.setAttribute("userName", username); request.setAttribute("password", password); RequestDispatcher dispatcher = request.getRequestDispatcher(ERROR_VIEW); dispatcher.forward(request, response); }else { //6.输入正确的信息 HttpSession session = request.getSession(); session.setAttribute("currentUser",currentUser); response.sendRedirect(SUCCESS_VIEW ); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <h1>登录</h1> <form action="textServlet" method="post"> 用户名：<input type="text" name="username" value="${username}" /><br/> 密 码：<input type="password" name="password" value=""/><br/> <input type="submit" value="登录"/> <a href="regist.jsp">注册</a> </form> <font color="red">${error}</font> </body> </html>
package com.dhy.bean; public class Users { String username; String password; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Users(String username,String password) { this.username=username; this.password=password; // TODO Auto-generated constructor stub } public Users() { // TODO Auto-generated constructor stub } }